click-compose-button

THE RISK

High Risk

Why click-compose-button needs a policy

This tool performs a browser action (clicking a UI element) that triggers an external operation — opening the tweet composition editor on Twitter/X. It is an Execute-category action because it interacts with an external platform's UI. Severity is medium because while it only opens the editor (not submitting content), it initiates a workflow that could lead to unintended posts if combined with other tools.

From the tool's definition Click the compose/new tweet button to open the tweet editor

Documented attack patterns abuse exactly the kind of access click-compose-button gives an agent:

POLICY

How to control click-compose-button

PolicyLayer is an MCP gateway — it sits between your AI agents and MoltBrowser MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for click-compose-button:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "click-compose-button": {
      "limits": [
        {
          "counter": "click-compose-button_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

click-compose-button stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register MoltBrowser MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More MoltBrowser MCP Server tools

Destructive contribute_delete-tool Delete a specific tool from a WebMCP Hub config. The config owner or the tool\ Execute hub_execute Execute a pre-configured hub tool for the current site. After navigating, the response wil Execute click-post-button Click the Post button to submit the tweet Write contribute_vote-on-tool Upvote or downvote a tool within a WebMCP Hub config. Each user gets one vote per tool — v Write fill-search Fill the search input field with a query. After calling this, use browser_press_key({ key: Write fill-tweet-text Fill the tweet text area with content Read get-article Get the main article text Read get-posts Get all visible posts on the page

All 9 MoltBrowser MCP Server tools →

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Go deeper

High-risk tools in MoltBrowser MCP Server → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about click-compose-button

What does the click-compose-button tool do? +

Click the compose/new tweet button to open the tweet editor. It is categorised as a Execute tool in the MoltBrowser MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on click-compose-button? +

Register the MoltBrowser MCP Server MCP server in PolicyLayer and add a rule for click-compose-button: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches MoltBrowser MCP Server. Nothing to install.

What risk level is click-compose-button? +

click-compose-button is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit click-compose-button? +

Yes. Add a rate_limit block to the click-compose-button rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block click-compose-button completely? +

Set action: deny in the PolicyLayer policy for click-compose-button. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides click-compose-button? +

click-compose-button is provided by the MoltBrowser MCP Server MCP server (joakim-sael/moltbrowser). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MoltBrowser MCP Server tool call.

Start from MoltBrowser MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →